METHOD FOR PHASE AUTOMATIC FREQUENCY CONTROL WITH FILTRATION Russian patent published in 2016 - IPC H03L7/00 

FIELD: physics.

SUBSTANCE: method for phase automatic control enables synchronisation from single-phase initial signal with interference. System includes units of: first order phase filtration, second order band-rejection filter, first order low-pass filtering, integration, multiplication, digital filters coefficients calculation, four-quadrant arctangent. Use of discrete methods for physical implementation with the help of microprocessor devices enables performing comparison and calculation of non-linear functions with acceptable accuracy and computational resources. Filters are implemented with variable coefficients and have the first and the second orders. Due to relatively low sensitivity of the phase filter to the frequency change the reference phase can be fastly identified from the initial signal. Use of discrete integrator with feedback by integration coefficient enables the synchronised frequency signal fast setting to the operational mode. Use of discrete filter with variable coefficients and taking into account the phase transition through limiting values enables efficient filtration of the synchronised phase without its shift relative to the phase of the initial signal fundamental harmonic. This method makes it possible to build on its basis systems of control by harmonic components in single- and multiphase systems and by symmetrical components in multiphase systems. Main application of this method is in control of conversion equipment, it can also be used for fast synchronisation in communication equipment and other applications with the requirements of high speed of operation by setting up to the main frequency and reference phase identification.

EFFECT: improved performance of practical fast synchronisation up to one-two periods of synchronised frequency signal, interference filtering in generated signals of synchronised phase and frequency.

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